"I got all the questions right", "I got all the answers right". Do these two sentences mean the same thing? (I answered all the questions correctly.)

Would you say "I have 2 gallons of gas less than you do" or "I have 2 gallons of gas fewer than you do"? I do realize that "less" is for uncountable nouns, "fewer" for countable, but this case is confusing. On the one hand, we're talking about the amout of gas and "gallon" is a unit of measurment, on the other hand, "gallons" could (probably) be countable, especially if you picture vessels in your head, while saying this.

Dear italki users, could you help me with this sentence please? "I sold it for a few hundred" Is it "a few hundred" or a "a few hundredS"? I'm sure that with "dollars" it would be "a few hundred dollars", but I'm not sure if it's still "hundred" if we omit "dollars"

Dear italku users, could you help me with these sentences? 1. I have two gallons less gas than you do (ex. you have 10, I have 8) 2. I have the same amount of (the?) gas that you do I'm not sure that the sentence 1 is correct. As for the sentence 2, I'm not sure if there has to be "the" or is it just possible depending on the context. Thank you.

Just a couple of cute stray kitties

"Put the gun down" - meaning Dear italki users, I wonder if "put the gun down" can mean "lower your gun", not put it literally on the ground. In Terminator 2, John Connor said to the Terminator "Put the gun down", when he was about to shoot an innocent man. My guess is that John probably just meant "don't shoot", "lower your weapon", but the Terminator literally put (not dropped) the gun down. This is where the question comes from.

"The police pulled me over" VS "The police flagged me down" Dear italki users, Could you help me with these two sentences, please? 1. The police pulled me over. 2. The police flagged me down. As far as I know, both mean the police made me stop my car. But I guess that "pull over" implies that the officer was driving too, whereas "flag down" means that the officer was standing by the road and gestured me to stop. Is my guess correct?

"Look out for your neighbors" - ambiguity? Dear italki users, As far as I know the phrasal verb 'look out for' have at least two meanings: 1) take care, look after somebody, 2) keep alert I wonder if there is ambiguity in this sentence: "Look out for your neighbors" Can it mean both take care and be alert depending on the context?

"I will finish/have finished cooking by the time you come home" Dear italki users! As far as I know, we should use Future Perfect in such sentences as: 1. I will have finished cooking by the time you come home 2. I will have read the book by Monday 3. Next week, I will have lived here for 20 years (I'm not sure if this one is correct, though) I wonder what would happen if we used Future Simple here instead: 1a. I will finish cooking by the time you come home 2a. I will read the book by Monday 3a. Next week, I will live here for 20 years. Are those three sentences just grammatically incorrect or they are possible but have slightly different meaning?